AT&T System 75, Wiring Diagram

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CHAPTER 2. HARDWARE (66/110-Type)
187B1 Backboard
The 187B1 backboard (Figure 2-15) provides 16 pegs that are used to
dress the cross-connecting wire between connecting blocks. The
187B1 backboards can be used with any arrangement of 66-type
connecting blocks.
Figure 2-15. 187B1 Backboard
187B1 BACKBOARD ORDERING INFORMATION
Description
Comcode
187B1 Backboard
101 937 944
Power Adapter Cords
The power adapter cord (Figure 2-16) connects an adjunct power
supply to a 4-pair station circuit terminated on a 66-type connecting
block. The cord consists of a 2-pair cable equipped with a 6-conductor
modular plug. The plug end connects to the power supply and the other
end terminates on the 66-type connecting block.
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